Electronic Mosquito Repellent Circuit

Various mosquito repellent solutions like coils, liquid vaporizers, and creams, all have possible adverse effects on health. Then there are electronic mosquito repellents available in the market which are equally efficient and relatively safer. The concepts of these mosquito repellers are simple and we can build a simple mosquito repellent circuit at home easily by using 555 timer IC and few other commonly available components.

1. 555 Timer IC
2. Buzzer
3. Resistors - 1k and 1.3k (variable resistor of 10k)
4. Capacitor - 0.01µF
5. Battery - 9v
6. Breadboard and connecting wires

As shown in the above diagram, we have designed a circuit using 555 timer IC in Astable mode to produce 40 kHz frequency sound. We have connected Buzzer at the output (PIN 3) of the 555 timer IC so that a sound of desired frequency can be generated. We should note here that we need a HIGH-frequency Piezo buzzer so that a high-frequency sound can be generated. Also note that we might not be able to hear the sound, generated by the circuit as it is beyond our audible range.

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